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Proceedings Paper

All-polymeric sensing platform based on packaged self-assembled bottle microresonator (Conference Presentation)
Author(s): Romeo Bernini; Immacolata A. Grimaldi; Gianluca Persichetti; Genni Testa

Paper Abstract

In recent years, microbottle resonators that support non-degenerate whispering gallery modes (WGMs), propagating by successive total internal reflections close to the resonator surface and all along its axis, have been widely investigated due to their potential applications in optical sensing, microlasers and nonlinear optics. To overcome some drawbacks of the standard silica microbottle resonators, we focused our attention on polymers such as SU-8 resist and NOA resins. A drop of polymeric material is dispensed onto a fiber stem, providing a mechanical support for the bottle resonator, and is photo-polymerized by an UV lamp. The interrogation system, usually constituted by a tapered silica fiber evanescently coupled with the microresonator, is substituted by a more stable planar waveguide realized in SU-8 by means of standard photolithography technique. Moreover, for guarantying the stability to surrounding disturbance of the coupling between the microbottle resonator and the planar waveguide, the fiber stem is glued to substrate. Two drilled holes in the substrate allow the rise of the glue at the ends of the fiber stem and the fixing of sensor on PMMA substrate. In the present work, we presented an integrated full polymeric platform with self-assembled bottle microresonators packaged in a stable structure. SU-8 and NOA based microbottles are realized and morphologically characterized. The low autofluorescence emission and long term stability make the NOA based bottles suitable to be employed in a great variety of conditions. Bulk sensing measurements are performed by using water:ethanol solutions and a bulk sensitivity of 120 nm/RIU is estimated.

Paper Details

Date Published: 19 April 2017
PDF: 1 pages
Proc. SPIE 10106, Integrated Optics: Devices, Materials, and Technologies XXI, 101060L (19 April 2017); doi: 10.1117/12.2253607
Show Author Affiliations
Romeo Bernini, Istituto per il Rilevamento Elettromagnetico dell'Ambiente (Italy)
Immacolata A. Grimaldi, Istituto per il Rilevamento Elettromagnetico dell'Ambiente (Italy)
Gianluca Persichetti, Istituto per il Rilevamento Elettromagnetico dell'Ambiente (Italy)
Genni Testa, Istituto per il Rilevamento Elettromagnetico dell'Ambiente (Italy)

Published in SPIE Proceedings Vol. 10106:
Integrated Optics: Devices, Materials, and Technologies XXI
Sonia M. García-Blanco; Gualtiero Nunzi Conti, Editor(s)

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